: MKV files are more "robust" than MP4; for example, if a recording or download is interrupted, an MKV file is often still playable up to the point of the crash, whereas an MP4 would likely be corrupt. How to Create MKV Movies

These sites use the MKV format's popularity as a marketing hook, advertising:

During this era, groups like axxo , DIMENSION , and SPARKS released movies in AVI or early MKV format. Sites like KickassTorrents and The Pirate Bay dominated search results. Users would type specific strings like "www.mkvmovies.com" (a defunct domain) to find low-compression 700MB MKV rips.

The Matroska Revolution: Why MKV is the Ultimate Movie Container

Think of an MP4 file as a suitcase that holds a specific type of clothes. An MKV file is a massive shipping container that can hold clothes, furniture, electronics, and documents all at once.